Science doesn’t support a link between global warming and recent hurricane activity, notes Max Mayfield, director of the National Hurricane Center. Katrina and Rita are part of a natural cycle. The increase in number and intensity of storms since 1995 is hardly unprecedented, says William Gray, a leading hurricane expert based at Colorado State University. He points out that two major hurricanes hit the Gulf Coast only six weeks apart in 1915, mimicking the doubly whammy of Katrina and Rita.

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